Buggy code:
public class WattboxController implements ISmartController { static final double [ ] INITIALIZATION_TEMPS = new double [ ] { 7 , 7 , 7 , 7 , 7 , 7 , 6 , 6 , 7 , 7 , 8 , 8 , 9 , 9 , 10 , 10 , 11 , 11 , 12 , 12 , 13 , 13 , 14 , 14 , 15 , 15 , 16 , 16 , 17 , 17 , 18 , 18 , 17 , 17 , 16 , 16 , 15 , 15 , 14 , 14 , 12 , 12 , 10 , 10 , 8 , 8 , 7 , 7 } ; HouseholdProsumer owner ; WattboxUserProfile userProfile ; WattboxLifestyle userLifestyle ; int ticksPerDay ; double [ ] dayPredictedCostSignal ; double predictedCostToRealCostA = 9 ; double realCostOffsetb = 10 ; double [ ] setPointProfile ; double [ ] optimisedSetPointProfile ; double [ ] currentTempProfile ; double [ ] priorDayExternalTempProfile ; double [ ] heatPumpDemandProfile ; double [ ] hotWaterVolumeDemandProfile ; double [ ] EVChargingProfile ; double [ ] heatPumpOnOffProfile ; protected CascadeContext mainContext ; private boolean coldAppliancesControlled = true ; private boolean wetAppliancesControlled = true ; private boolean waterHeatingControlled = true ; private boolean spaceHeatingControlled = true ; private boolean eVehicleControlled = true ; private double [ ] waterHeatDemandProfile ; private double maxHeatPumpElecDemandPerTick ; private double expectedNextDaySpaceHeatCost ; private double maxImmersionHeatPerTick ; private double [ ] noElecHeatingDemand = new double [ ] { 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 } ; private void evaluateProbabilities ( ) { } public void update ( int timeStep ) { } public WeakHashMap getCurrentProfiles ( ) { } private void optimiseEVProfile ( ) { } private void optimiseWaterHeatProfileWithSpreading ( ) { } private double [ ] spreadWaterDemand ( double [ ] basicDemandArray ) { } private void optimiseWetProfile ( int timeStep ) { } private void optimiseColdProfile ( int timeStep ) { } public void setDayPredictedCostSignal ( double [ ] dayPredictedCostSignal ) { } void optimiseSetPointProfile ( ) { } private double [ ] calculateSpaceHeatPumpDemand ( double [ ] localSetPointArray ) { double [ ] energyProfile = new double [ ticksPerDay ] ; double [ ] deltaT = ArrayUtils . add ( localSetPointArray , ArrayUtils . negate ( priorDayExternalTempProfile ) ) ; double maxRecoveryPerTick = 0.5 * ( Consts . DOMESTIC_COP_DEGRADATION_FOR_TEMP_INCREASE ) ; for ( int i = 0 ; i < ( ticksPerDay ) ; i ++ ) { double tempChange ; if ( i > 0 ) { tempChange = ( localSetPointArray [ i ] ) - ( localSetPointArray [ ( i - 1 ) ] ) ; } else { tempChange = ( localSetPointArray [ i ] ) - ( this . setPointProfile [ 0 ] ) ; } double setPointMaintenanceEnergy = ( ( ( this . setPointProfile [ i ] ) - ( priorDayExternalTempProfile [ i ] ) ) * ( ( owner . buildingHeatLossRate ) // ( Consts . KWH_TO_JOULE_CONVERSION_FACTOR ) ) ) * ( ( Consts . SECONDS_PER_DAY ) // ( ticksPerDay ) ) ; double tempChangeEnergy = tempChange * ( owner . buildingThermalMass ) ; double heatPumpEnergyNeeded = Math . max ( 0 , ( ( setPointMaintenanceEnergy + tempChangeEnergy ) // ( Consts . DOMESTIC_HEAT_PUMP_SPACE_COP ) ) ) ; if ( ( deltaT [ i ] ) < ( Consts . HEAT_PUMP_THRESHOLD_TEMP_DIFF ) ) { heatPumpEnergyNeeded = 0 ; } <START_BUG> if ( heatPumpEnergyNeeded > ( ( owner . ratedPowerHeatPump ) * ( Consts . DOMESTIC_HEAT_PUMP_SPACE_COP ) ) ) { <END_BUG> return null ; } energyProfile [ i ] = heatPumpEnergyNeeded ; } return energyProfile ; } private double evaluateCost ( double [ ] localDemandProfile ) { } public WattboxController ( HouseholdProsumer owner ) { } public WattboxController ( HouseholdProsumer owner , CascadeContext context ) { } public WattboxController ( HouseholdProsumer owner , WattboxUserProfile userProfile , WattboxLifestyle userLifestyle ) { } }

Fix:
if ( heatPumpEnergyNeeded > ( ( ( ( owner . ratedPowerHeatPump ) * ( Consts . DOMESTIC_HEAT_PUMP_SPACE_COP ) ) * 24 ) // ( ticksPerDay ) ) ) {